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Explain Function.prototype.bind.

Explain Function.prototype.bind.



Asked On2019-06-19 13:22:52 by:gokilapriya

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Function.prototype.bind
bind is a method on the prototype of all functions in JavaScript. It allows you to create a new function from an existing function, change the new function’s this context, and provide any arguments you want the new function to be called with. The arguments provided to bind will precede any arguments that are passed to the new function when it is called.
Using bind to change this in a function
The first argument provided to bind is the this context the function will be bound to. If you do not want to change the value of this pass null as the first argument.
You are tasked with writing code to update the number of attendees as they arrive at a conference. You create a simple webpage that has a button that, when clicked, increments the numOfAttendees property on the confrence object. You use jQuery to add a click handler to your button, but after clicking the button the confrence object has not changed. Your code might look something like this.
var nodevember = {
  numOfAttendees: 0,
  incrementNumOfAttendees: function() {
    this.numOfAttendees++;
  }
  // other properties
};
$('.add-attendee-btn').on('click', nodevember.incrementNumOfAttendees);
This is a common problem when working with jQuery and JavaScript. When you click the button the this keyword in the method you passed to jQuery’s on method references the button and not the conference object. You can bind the this context of your method to solve the problem.
var nodevember = {
  numOfAttendees: 0,
  incrementNumOfAttendees: function() {
    this.numOfAttendees++;
  }
  // other properties
};
$('.add-attendee-btn').on('click', nodevember.incrementNumOfAttendees.bind(nodevember));
Now when the button is clicked this references the nodevember object.

Answerd on:2019-06-28 Answerd By:KAPILJHADE

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